Swift slower than Flutter for select sort algorithm - swift

Question

I implemented select sort in Flutter and in SwiftUI. I made the implementations as similar as possible.
Swift:
func selectSort(list: inout [Double]) -> [Double] {
for i in 0..<list.count {
var minElPos = i;
for j in (minElPos + 1)..<list.count {
if list[j] < list[minElPos] {
minElPos = j;
}
}
// swap
let temp = list[i];
list[i] = list[minElPos];
list[minElPos] = temp;
}
return list;
}
// Measuring time
func generateRandomList(size: Int) -> [Double] {
var res = Array<Double>(repeating: 0.0, count: size)
for i in 0..<size {
res[i] = Double.random(in: 0...1)
}
return res;
}
var arrayToTest: [Double] = generateRandomList(size: 8000);
let startingPoint = Date()
selectSort(list: &arrayToTest);
let time = startingPoint.timeIntervalSinceNow * -1;
Flutter:
class SelectSort {
static List<double> call(List<double> list) {
for(int i = 0; i < list.length - 1; i++) {
int minElPos = i;
for(int j = minElPos + 1; j < list.length; j++) {
if(list[j] < list[minElPos]) {
minElPos = j;
}
}
// swap
double temp = list[i];
list[i] = list[minElPos];
list[minElPos] = temp;
}
return list;
}
}
// Measuring time
class Utils {
static List<double> generateRandomList(int nbOfElements) {
var random = new Random();
List<double> res = List(nbOfElements);
for (var i = 0; i < nbOfElements; i++) {
res[i] = random.nextDouble();
}
return res;
}
}
List<double> arrayToTest = Utils.generateRandomList(8000);
final stopwatch = Stopwatch()..start();
SelectSort.call(arrayToTest);
stopwatch.stop();
int time = stopwatch.elapsedMilliseconds;
I measured the execution time for an array of random numbers. The array size is 8000. Flutter needs 0.053s and SwiftUI needs 0.141s. Does anyone have a clue why flutter as a hybrid framework has better performance than a native solution?
Both apps were run in release mode on a physical device.